gn: Add missing NDEBUG define in Release

This is required at least on Windows as it's used by system headers to
control things like assert, etc.

R=brettw@chromium.org
BUG=335824,354261

Review URL: https://codereview.chromium.org/475153002

Cr-Commit-Position: refs/heads/master@{#293788}

build/config/BUILD.gn

@@ -210,6 +210,9 @@ config("debug") {
 }
 
 config("release") {
+  defines = [
+    "NDEBUG",
+  ]
 }
 
 # Default libraries ------------------------------------------------------------

third_party/libphonenumber/BUILD.gn

@@ -44,6 +44,11 @@ static_library("libphonenumber_without_metadata") {
     "src/phonenumbers/utf/unilib.cc",
   ]
 
+  # TODO(scottmg): Temporary until https://codereview.appspot.com/134650043/
+  # lands and rolls. http://crbug.com/335824
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
   direct_dependent_configs = [ ":libphonenumber_config" ]
 
   deps = [